Daniel Ricciardo sets the pace in Spain as ailing Lewis Hamilton toughs it out

Updated 1927 GMT (0327 HKT) February 20, 2015

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Photos:Ricciardo fastest in Barcelona testing

Australia's Daniel Ricciardo set the fastest time of the second day in his Red Bull as he looks to build on his third place in last season's F1 championship.

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Photos:Ricciardo fastest in Barcelona testing

World champion Lewis Hamilton was the subject of close media scrutiny as he arrived for afternoon testing in Barcelona. Hamilton had to cut short his track time Thursday because he was feeling unwell but impressed in his Friday runs.

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Photos:Ricciardo fastest in Barcelona testing

Two-time world champion Fernando Alonso was able to get in some valuable laps for his new team McLaren-Honda which has encountered problems in the early season testing.

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Photos:Ricciardo fastest in Barcelona testing

Kimi Raikkonen also showed impressive pace in the 2015 Ferrari as the Prancing Horse looks to build on a promising start to the season in testing.

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Photos:Ricciardo fastest in Barcelona testing

Nico Rosberg celebrated the news that his wife is pregnant with their first child with a solid 65 laps on a medium tire compound in the morning.

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Story highlights

Daniel Ricciardo sets fastest time in second day of testing at Circuit de Catalunya

(CNN)World champion Lewis Hamilton emerged from his sick bed for a marathon stint in his Mercedes but it was Red Bull rival Daniel Ricciardo who set the fastest time on the second day of F1 pre-season testing in Barcelona Friday.

Hamilton had to cut short his session on the first day as he complained of a fever and his reappearance for the afternoon runs at the Circuit de Catalunya came as something of a surprise to the fans and media following proceedings.

He duly completed 89 laps and ominously for Mercedes' rivals for the upcoming season set the fifth fastest time, despite running on slower medium compound tires.

The 30-year-old Briton was just over a third of a second slower than the one minute 24.574 seconds posted by Ricciardo, who set the time on a soft tire, generally reckoned to be about one second faster per lap than the medium.

Hamilton's teammate Nico Rosberg had taken the wheel for the morning session and completed 66 laps -- eventually finishing sixth on the time sheets, with his best lap also set on the medium tire.

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Rosberg, troubled by a neck injury Thursday, had double reason to celebrate his promising showing as he announced on social media that his wife Vivian was expecting their first child.

Exciting time for our little family! Vivian is pregnant and if all goes well we will get a little babygirl in august! pic.twitter.com/3yMrvxZbpH

While Mercedes appears set to continue its 2014 dominance into the new season, it was undoubtedly an improvement for Ricciardo and Red Bull, as the Australian attempted to simulate race conditions and totaled 143 laps over the two sessions, the most by a single driver on the second day.

Ferrari -- so off the pace in Fernando Alonso's final season with the famous marquee in 2014 -- has also found encouragement from the two pre-season tests to date and Kimi Raikkonen was second fastest behind Ricciardo.

Third best was the Williams of Felipe Massa, with less than a tenth of a second separating the top three. Sergio Perez was fourth fastest in the year-old Force India VJM07.

With the first race of the season less than a month away from March 13-15 in Australia, time is running out for team's struggling with their 2015 cars, not least CNN-sponsored McLaren-Honda, with former world champions Alonso and Jenson Button in its driver lineup.

Alonso, who has switched from Ferrari, was finally able to get some meaningful action under his belt with a total of 59 laps and the seventh fastest time.

McLaren's MP4-30 is using cutting edge technology combined with a new Honda engine, but there have been extensive teething problems.

Two sons of illustrious motorsport fathers were also in action Friday. Jolyon Palmer, whose father Jonathan raced in F1, was eighth best for Lotus in his first test at this level.

Carlos Sainz Jr, the offspring of the former world rally champion, drove for Toro Rosso and racked up 100 laps although triggering a red flag when he went off and into the gravel on Turn 9 at the Spanish circuit.

Testing continues for the next two days at the same venue and the teams return from next Thursday for a final four days to iron out problems before the season starts for real.